Abstract: Provided is a nuclear radiation monitor which has a surface on which are located separate, visible indicia, such as LEDs or an LCD array, with the indicia being distributed around an imaginary closed loop, preferably of circular configuration. The monitor includes a radiation-sensitive apparatus, including a radiation sensor, and the apparatus is adapted to create a discharge every time a particle or pulse of radiation strikes the sensor window with sufficient intensity. The device incorporates electrical circuitry for causing sequential discharges to energize the visible indicia in a similar sequence, such that the indicia are perceived to be in motion around the loop, with a rotational speed substantially proportional to the frequency of occurrence of the discharges. Included on the surface is a central area depicting an atom with at least 3 indicia, such as LEDs or an LCD array, which flash when a preset threshold is exceeded by the radiation rate.

Abstract: Provided is a nuclear radiation monitor which has a surface on which are located separate, visible indicia, such as LEDs or an LCD array, with the indicia being distributed around an imaginary closed loop, preferably of circular configuration. The monitor includes a radiation-sensitive apparatus, including a radiation sensor, and the apparatus is adapted to create a discharge every time a particle or pulse of radiation strikes the sensor window with sufficient intensity. The device incorporates electrical circuitry for causing sequential discharges to energize the visible indicia in a similar sequence, such that the indicia are perceived to be in motion around the loop, with a rotational speed substantially proportional to the frequency of occurrence of the discharges. Included on the surface is a central area depicting an atom with at least 3 indicia, such as LEDs or an LCD array, which flash when a preset threshold is exceeded by the radiation rate.

Abstract: A sensor post has a hollow interior and a semi-rigid surface which flexes in response to an applied force. Sensor bars are mounted to the semi-rigid surface in a cantilevered fashion, and include an intermediate electrically insulated section located inside the interior of the sensor post. The sensor element mounting means is rigidly mounted to a portion of the sensor post which remains essentially stationary during an intrusive event. Sensing elements are made of a flexible semi-conductive sensing material, whose resistance increases when the material is stretched, and are mounted so as to straddle an electrically insulated section of the sensor bars. A signal analysis means detects an increase in the resistance of the sensing elements and generates an alarm.

Abstract: A rate of ascent monitor for drivers uses a sound transducer with velocity characteristics, preferably a diaphragm type piezoelectric transducer, to sense rate of pressure change, and a threshold detector connected to the transducer to drive an indicator providing a warning of an excessive rate of ascent. A second threshold detector can be used to discriminate between descending and ascending motion. The device can be a compact wrist mounted unit.